Probability of the unit digit of the chosen number is less then 4
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Step-by-step explanation:
0,1,2,3,4 is your answer
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Probability of first number being less than 4 is 3/8. Given that that has happened, the probability of the second number being less than 4 is 2/7. Probability of both is 3/8 * 2/7, or 6/56 or 3/28.
Another approach: there are 28 possible pairs of numbers. Of these, three pairs match the criteria: {1,2}, {1,3}, {2,3}. So 3/28 of the pairs match.
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